document.write( "Question 71638: 21 = 2(4a + 2) \n" ); document.write( "

Algebra.Com's Answer #51217 by checkley75(3666) $\"\"$ $\"About$

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21=2(4a+2)
\n" ); document.write( "21=8a+4
\n" ); document.write( "8a=21-4
\n" ); document.write( "8a=17
\n" ); document.write( "a=17/8
\n" ); document.write( "proof
\n" ); document.write( "21=2(4*17/8)+2)
\n" ); document.write( "21=2(68/8+2)
\n" ); document.write( "21=2(8.5+2)
\n" ); document.write( "21=2(10.5)
\n" ); document.write( "21=21 \n" ); document.write( "

\n" );